In the Alfresco Outlook Client, if you copy a single file to a folder in Alfresco Share, and then decide to cancel the transfer, the file will still transfer into Share. This is because unless the client-server connection is very slow or the file is very big, the file transfers too quickly to be cancelled. The Cancel action works best when transferring multiple files - the last transferred file will remain in Share, however the other files will not be transferred.